How to translate plugin custom strings

I’ve looked at wp globus translate options plugin and although it works fine for plugins like revolution slider, it doesn’t work for booking one i have.

I’ve looked at “WPGlobus Plus multilingual extension” which technically explains, it should be able to make it work but i am not sure.

Here is the screenshoot of custom field.

http://www.imagebam.com/image/b0bd231326223896

Any suggestions if paid version could work or how to make it work would be appreciated.